Floor structure and slab therefor



Dec. 20, 1932. A. HENDERSON FLOOR STRUCTURE AND SLAB THEREFOR Filed Nov. 3, 1927 Sheets-Sheet l INVENTOR .NHNL

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A. HENDERSON Filed Nov. 3. 1927 v 2 Sheets-Sheet 2 Patented Dec. 230, 19.32'

l UNITED STATES.

ALBERT HENDERSON, 0F PITTSBURGH, PENNSYLVANIA,VK ASSIGNOR T0 GENERALE` CEMENT PRODUCTS COMPANY, 0F PITTSBURGH, PENNSYLVANIA, A'CORPORATION OF PENNSYLVANIA FLOOR STRUCTURE AND SLABA THEEEFOR Application led November 3, 1927. Serial No. 230,768.

The present invention is directed to floors of a cementitious character, and more particularly to 'van improved floor slab unit and a floor construction built therefrom. v

At the present time it is common practice to set up the steel work of large buildings, and thereafter provide forms between the beams and pour the flooring around the forms. Not only is such an operation extremely slow, but it necessitates accurate laying of all pipes, conduits, and the like, before the ioor is poured. Calculations of standard building constructions show that the dead load of the floor structures per square foot in standard buildings is in excess of the liveload per square foot which such floors are designed to carry.V Y

I provide an improved floor` construction adapted to be laid without the use of any forms, and of such nature that not only is the dead load materially descrease'd, but the strength is increased. At the same time, provision is made for the expeditious laying or re-arranging of conduits, pipes, and the like, as desired or as found necessary." Y

I further provide a preformed floor slab, of

such nature that a complete floor may be temporarily laid for purposes of convenience during the erection of the framework,or that sections of the flooring may be installed temporarily and thereafter easily removed if desired.

In ordinary constructions employing preformed concrete beams and a cement finish coat, the finish coat is regarded as dead load and not as part of the beam. This is dueto the fact that no'provision is made for strongly tying the finish coat to the beams so that it acts therewith. I provide means on the top of the floor slabs adapted to bond with a becomes an integral part of the beam and may be included in the calculations. I also provide recesses between adjacent slabs'so as to permit of employing tie rods running length- Wise and crosswise of the floor. The finish coat extends into these recesses and firmly bonds with the tie rods.

I further provide means on the lprecast beams for securing a ceiling or ceiling-p0rtion to the bottoms of the beams. It is generally only necessary to give the beams a depth which is relatively less than the distance ordinarily provided from floor to ceiling, and I ltherefore provide cementitious downwardly extending portions to which a ceiling may be secured. `These downwardly extendingportions are preferably provided with metal posts or studs which may be inserted `through openings in metallic lath and bent over to 'ahold the lath in place.` Similar fastening means may be employed for other forms of ceilings, as for example, pressed'metal ceilings. v

Inth'e accompanying drawings there Iis shown,`by way of illustration and not by way of limitationone form of floor structure and Y slab constructed in accordance with and embodying the novel features of the presentinvention.

In the drawings, A Figure'l is a sectional view through a ortion-ofailoor illustrating my improved vs abs lin position therein,

Figure 2 is a longitudinaldsectional view through one of the floor slabs,

Figure 3 is a transverse sectional view VVthrough one ofthe floor slabs, showing the position of adjacent slabs, and

. Figure 4 isa sectional view on an enlarged scale'through one of the beams, illustrating a preferred manner of fireproong the same,

and showing the slabs in cooperative relation thereto. i

Referring more particularly to the drawings, a floor made in accordance with thel present invention comprises'beams 2 suitably spaced and extending in a substantially parallel relation one tothe other. `Provided for cooperation with these beams is a series of field cast floor finish so that the finish coat Vflanges 4 thereV are providedspaced projections 5. The openings 6 between these projections leave a free space through which conduits, pipes, wires Land the like may be readily passed.

The slabs are eachformed with end projections Thaving a length substantially equal to half the width of the ianges on the beams Zwith which they are to cooperate, whereby the projectionsmay overliev thebeams, as` shown in Figure 1. The end projections 7 are made of sutcient depth to resist the shear load. This generally requires a depth somewhat less than the depth of the body of the4 beam,v and this is of value since it reduces the total required distance fromthe bottom of the beams to the floor proper.

As above stated, the iield c ast'floor finish, which isfapplied tothe floor whencompletely laid, is. generally considered merely as dead load. orderto firmly unite the cement finish with the beams, the beams are each provided withlwires 9 which areembedded in the beani. "The wires are bent so Vthat the end portions are embedded while. loops 10 project abovethetop surface. The middle portionsof the wires are formed into loops 11 which arealso embedded inthebeams. Vhen the finish coat v12 is applied, the loops 10are firmly embedded therein so strongly tie the finish coat tothe preformed slabs that it maybe ligured as part of theV beams.

The` 'slabs arev also formed with recessed endsl and.V corners 13 forming dovetailed grooves 15 into which the finish entends so Y twisted'togetheiyas indicated at 18, tohold the sections, against displacement.' The sections, have .incorporated therein hangers 1,9 which overlie the top flange of each of the beams, and support the sections. The hangers 19 willhavea width such that they maylie in the space between the flanges etv of the respective slabs.

The slabs are each provided with a metallic flap 420 which during shipment is bent back to the position shown in dotted linesin Figure: el. After the pre-castunitseforming the structureihavebeen put in place, the flaps 2O arey bent down to the position shown in solid lines in FigureY esoas to close oii' lthe spacesbetwen the iianges of the several slabs. IVhen the finish coat'12 is poured, itL runs down into the space between the flaps20of abutting slabs, shown in Figure Al, and ills the lspace between the top of the metallic beams 2 and the bottoms of the slab bodies 3.

'on the beams 2, and in addition completely surrounds the upper ends of the wires 17 and the hangers 1 9.. A

Y Each of the projections isprovidedgwith a wire 21 which extends do,wnwardlyA Metal lath 22 may be secured in place by pressing it upwardly against the wires 21 so that their free ends proj ect through the openings in the lath. The wires 21 are then bent over as shown in` Figure 4 so as to hold the lath in place ready A 'to receive plaster 28. The plaster extends around, the sections 16 and into the opening between such sections at their bottom portions, thus giving a complete finish for the ceiling and surrounding the lower twisted ends18-of the wires 17.

Reinforcing, rods. 211 are provided in each ofjtheilanges 4 of the prefcast slabs. These reinforcing rods ,are bent upwardly so as to project into the. end portions 7 over the beams.

While I have. illustrated anddescribedthe present preferred form of my invention, it will be understood that'. it is not limited tov this formf alone, but maybe otherwise embodiedv within the scope of the following claims :f i

I claim.:-

1. A floor structurelcomprising a beam, a 'recessed slaboverlying they beam, and a flap lying crosswise of the recess so as to deline the end of, a cement receiving space between the beam andthe topv portion of the slab.

2. In combination, spaced4 beams, a floorv carried by said beams comprising abutting reinforcedV- precast concrete planks having registering recesses inthe ends thereofv over the'jbeamsand having ltie members projecting therefrom, said planksand the beams` exclusively constituting a wetconcrete receiving form, reinforcing members in the recesses and,a,castfinfplacerconcrete nishing coat. covering the planksl vandthe tie members.

3. In combination, spaced Ifbeams, con. creteL-membersenclosing the sides and-bottom of4 the IA-beams, said members having metalI ti-e wires extendingV from the ends thereof tied together, abutting precast reinforced concreteplanlis extending between the beams, said planks having,A recesses inthe endsthereof constituting, with the tops of the Lbeams andthe Lfmembers, a. permanent wet concrete receivingi form, anda cast-in place `concrete floor coverl onesaid planks, the concrete-of whichextends 'into ythe form and bonds the planks, the- Lfin'embers and the I-beams together. A

floor comprisingV a 'plurality of'precast Aslabs extending, betweensupporting beams and so positionedfas to leave recessesV my hand.

- ALBERT HENDERSON. 

